Final answer:
The Greeks built the deceptive Trojan Horse during the 10th year of the Trojan War to infiltrate Troy's walls.
Step-by-step explanation:
In the 10th year of the Trojan War, the Greeks, unable to breach Troy's formidable defenses, devised a cunning strategy. They constructed the infamous Trojan Horse, a massive wooden structure concealing Greek soldiers. Pretending to abandon the siege, the Greeks left the horse at the gates of Troy as a supposed offering to Athena. Unaware of the concealed soldiers inside, the Trojans brought the horse into their city.
Under the cover of night, the Greek soldiers emerged, opened the gates for their comrades, and overran Troy. This strategic masterpiece, as recounted in Homer's "Iliad" and Virgil's "Aeneid," remains an enduring symbol of deceit and victory in ancient Greek mythology and military history.